Locking device for step ladders,申请号GB19380030321-传众专利搜索

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发明名称	Locking device for step ladders
摘要
申请公布号	GB509107(A)	申请公布日期	1939.07.11
申请号	GB19380030321	申请日期	1938.10.20
申请人	FRANZ GROSSE	发明人
分类号	E06C1/16;E06C1/18	主分类号	E06C1/16
代理机构		代理人
主权项
地址

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